#!/bin/bash
function s1_generate_a_series_of_files(){
for index in {1..100};do cd /tmp/;echo "$index" > new_file$index;done
}
function s2_list_4_files_in_long_format_about_account_and_group(){
ls -l /etc/*{passwd,group,shadow,gshadow} | uniq |sort -i
}
function s3_find_items_related_to_given_username(){
grep -h "^$1" /etc/passwd /etc/shadow | sort -i
}
function s4_find_items_related_to_given_group_name(){
grep -h "^$1" /etc/group /etc/gshadow | sort -i
}
function s5_create_groups_for_given_group_names(){
groupadd rnd;groupadd itoperation
}
function s6_create_users_and_set_their_group_as_required(){
for username in {adam,bob,edward,calvin,david};do case $username in "adam"|"bob"|"edward")useradd -G rnd $username;;"calvin"|"david")useradd -G itoperation $username;;esac;done
}
function s7_change_users_shell(){
usermod -s  /usr/bin/sh adam;usermod -s /usr/bin/sh edward
}
function s8_set_password_change_policy(){
for username in {adam,bob,edward,calvin,david};do chage -m 10 $username;chage -M 60 $username;chage -W 10 $username;done
}
function s9_set_password_for_five_users(){
username=(adam bob calvin david edward)
for i in $(seq 1 5);do echo ${username[$i-1]}:$(($i)) | chpasswd;done
}
function s10_lock_bobs_password(){
passwd -l bob
}
function s11_include_adam_into_wheel_group(){
usermod -aG wheel adam
}
function s12_change_files_permission(){
for i in $(seq 3 3 100);do chmod u=rw,g=r,o-rwx /tmp/new_file$i;done
}
